Stereotype matrix



I May 28, 1946. I F. E; REILLY I 2,401,018

SIEREQTYPE MATRIX Filed Jan. 27, 1944 ATTORNEY Patented May 28, 1946 UNITED STATE s ATENT STEREO-TYPE MATRIX Frank E. Reilly; Chicago, Ill; assignor to Electroj graphic Corporation, New York, N. Y., a corpo- 1 ration of Delaware Application January 27, 1944, Serial No. 519,854

2 Claims.

The present invention relates to a novel and improved stereotype matrix.

Objects and advantages of the invention will be set forth in part hereinafter and in part will be obvious herefrom, or may be learned by practice with the invention, the same being realized and attained by means of the instrumentalities and combinations pointed out in the appended claims.

The invention consists in the novel parts, construction's, arrangements, combinations and improvements herein shown and described.

The accompanying drawing, referred to herein and constituting a part hereof, illustrates one embodiment of the invention, and together with the description, serves to explain the principles of the invention.

The single figure of the drawing is an enlarged, exaggerated, fragmentary sectional view of stereotype matrix in accordance with present inven-; tion, and illustrative thereof.

The present invention has for its object the provision of a novel and improved stereotype matrix of unusual durability and which is easily identified. A further object is the provision of an improved stereotype matrix in which the print to be produced from the cast stereotype may be seen on the matrix and the matrix is free casting.

In many cases a'large number of matrices are produced from a single halftone or line photoengraying and are distributed to the various printers who cast from them the plates which they will use in printing.

In so doing it is important that the matrices be identified properly so that the correct matrices are shipped and used for casting. Also, it is important that only matrices of good quality be shipped, and it is desirable that the matrices be capable of use for casting a large number of stereotypes and that the resulting stereotypes be of the best quality.

The present invention provides for the easy identification of the matrices so that mistakes in shipment and use are minimized; facilitates inspection so that only good quality matrices are shipped; and enables the production of more and better stereotypes from a given matrix.

It will be understood that the foregoing general description and the following detailed description as well are exemplary and explanatory of the invention but are not restrictive thereof.

In accordance with the present invention, the novel and improved matrix is illustratively produced by direct pressure molding of a dry fiong against the relief halftone or line photoengraving which has been previously inked with a special ink composed essentially of a pigment of a color to contrast strongly with the surface of the flong and a vehicle comprising a glyceride lubricant, such as neats-foot oil, containing a substantial or large amount of stearin, or other non-drying, non-volatile glyceride. On removing the matrix from the original, the original has been indented into the fiong and the ink is deposited on the bottoms of the indentations to provide a contrasting, easily judged image, while the stearin or other non-drying glyceride lubricant coats the bottoms of the indentations and, due to the slightly absorbent nature of the flong material, the lubricant spreads slightly to the edges of the indentations.

More specifically, the fiong preferably comprises a conventional laminated dry fiong which may be molded without beating and is preferably provided with a face of light color such as a light gray or pink.

The original photoengraving to be duplicated is placed on the "apron of the molding press and its printing surface is inked by means of a roller charged with a special ink which comprises essentially a black or dark pigment to contrast with the face of the flong and a nonvolatile oil which is a glyceride and is preferably largely stearin. I prefer to use neats-foot oil as it is largely the non-drying glyceride, stearin, does not easily rancify, does not readily evaporate or form a non-melting film, can withstand casting temperatures of about 550 F. without excessive decomposition and serves as a substantial lubricant.

Such an ink may comprise carbon black or other dark pigment and neats-foot oil, or other nonvolatile non-drying glyceride lubricant, mixed to the usual ink consistency.

The fiong is then placed face down on the inked original, the bearers are arranged and the assembly is subjected to the hydraulic pressure of the direct molding press in the usual manner and otherwise treated as usual to produce the finished matrix.

When removed from the original, and as shown in the drawing in detail, the matrix H] has the bottom of each indentation ll coated with contrasting pigment l2 which is held in place by the glyceride lubricant, while the sides of the indentations are free of pigment.

On casting, the heat of the molten stereotype metal causes the glyceride lubricant to diffuse slightly so that it extends very slightly onto the within the scope of accompanying claimsrwithe out departing from the principles of the invention and without sacrificing its chief advantages. Whatis claimedis: I

1. A stereotype matrix comprising a molded,

laminated, replica of a relief printing plate having indentations in one of its faces corresponding to the relief printing plate to be reproduced by stereotyp g, the bottom portions of the indentations being coated with a coloring material of contrasting color and a substantial proportion of stearin.

2. A stereotype matrix comprising a replica of a relief printing plate having indentations in one of its faces corresponding to the'raised portions of the printing plate to be reproduced by stereotyping, the bottom portions of the indentations being coated with a coloring material of contrasting. color and a substantialportion of a nonvolatile, non-drying glyceride lubricant absorbed by the matrix material.

FRANK E. REILLY. 

